Valve for gas-engines.



R. SCHMITZ.

VALVE FOR GAS ENGINES.

APPUCATION FILED AUG. 13. 1913.

Patented Aug. 14, 1917.

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Patented Aug. .14, 1917.

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RICHARD SGHMITZ, OF CHICAGO, ILLINOIS, ASSIGNOB. T SCI-IMI'I'Z ENGINECOMPANY, A CORPORATION ,OF SOUTH DAKOTA.

VALVE FOR GAS-ENGINES.

To all whom it may concern:

Be it known that I, RICHARD SoHMrrz, a citizen of the United States,residing at Ghicago, in the county of Cook and State of Illinois, haveinvented a certain new and useful Improvement in Valves for Gas-Engines, of which the following is a specification.

My invention relates to that class of engines in which a rotary valve isemployed to control the inlet and exhaust ports of the engine, and hasfor its primary object to provide a valve of such construction as topermit the formation of the ports of the engine in such shape that thepistonin its movement will run over the port, entirely closing it, andin this manner absolutely protects the valve from the force of theexplosion, thus materially lengthening the life of the valve. This is afeature which is impossible in any engine with which I am familiar, dueto the danger of the piston ring engaging the edges of the port, andthereby damaging both the piston and the cylinder, besides providing forthe, pressure due to compression of the charge being borne by the pistonand rings instead of by the valve.

My invention has for its further object to provide a valve which will beself-adjusting, and which will be protected from leakage by oil, andwhich will be of such construction that should it run dry, it will stillcontinue to operate without lubrication.

-My invention has for its further object to provide a construction whichwill permit of the use of a single valve for two cylinders, and toprovide a construction so that the mechanism for operating the inletvalve will operate the exhaust valve; and has for its further object toprovide self-cooling means on the exhaust valve, which will also havethe effect of materially assisting to exhaust: the products ofcombustion from the interior of the cylinder.

My means of accomplishing the foregoing may be more readily understoodby havlng reference to the accompanying drawings, which are hereuntoannexed and are a part of this specification. in which:

, Figure 1 is a side'elevation of an engine partially shown in sectionprovlded w th my improved valve, the view bemg the exhaust side oftheengine, the pressure plate which holds the valve to its seat beingremoved to show the interior,

Specification of Letters Patent. Patented A g. 14, 1917. Applicationfiled. August 13, 1913.

Serial No. 784,489.

Fig. 2 is a vertical sectional view through the center of the valvecasing, the valves and driving mechanism being shown in elevation.

Fig. 3 is a cross section taken through the center of the valves.

Fig. 4 is an enlarged detail view of the exhaust valve.

Fig. 5 is a cross section of the same.

Similar reference numerals refer to similar parts throughout the entiredescription.

As shown in the drawings, the engine is provided with cylinders 1 and 2,and a crank case 3 of the usual construction. 41 indicates the crank, 5the piston rods and 6 the pistons. 7 is a spiral gear mounted upon thecenter 'of the crank shaft and adapted to engage the spiral gear 8,mounted upona shaft 9 journaled in the side walls of the crank case 3.This shaft carries a sprocket 10, which carries a chain 11 adapted toengage a sprocket 12 mounted upon one end of the valve shaft 13. Myimproved valves are mounted upon this shaft and are in the shape of atruncated cone, the tapering sides 14 of which form the bearing surface.Ports 15 are cut in these tapering walls and are adapted to registerwith the ports 16 cut in the side walls of the cylinder. It will be seenfrom an inspection of the drawings that the shape of these ports 16 issuch that at no point does the ring of the piston engage the edges ofthe ports of the valve.

It will be obvious to persons skilled in the art that the ports 15 willbe constructed of the proper area to supply the requisite volume of gasto the engine and to permit the exhaust to escape. 17 indicates aflexible coupling consisting of a cross mounted in the center of theshaft 13. This permits the removal of either the exhaust or inlet valvewithout disturbing the other valve. 18 is the exhaust valve which ismounted upon the opposite end of the valve shaft 13, and on the oppositesides of the cylinders. It is provided with a port 19 adapted toregister with exhaust ports 20 in the engine cylinder. As more clearlyseen in the detail view, the valve is of hollow construction, providedwith a central hub 21, the end of which is adapted to engage a ballbearing 22 to take up whatever end thrust there may be upon the valve.

A coil spring 23 is adapted to hold the valve to its seat. I provide anoil pocket or seal by forming an annular groove 24 on the lower or innerface of the valve. This annular recess is designed to be filled with oiland affords a very effective seal to prevent the leakage of gas aroundthe inner end of the valve. It will be apparent from an inspection. ofFig. 3 that as the valve wears, the spring 23 will serve to hold it toits seat, so that it will take up all of the wear and keep tight as longas the valve lasts, and inasmuch as the pistons 6 protect the wall ofthe valve from contact with the explosion, this deterioration will be soslight as to scarcely amount to anything.

The valves are held to their seats by means of rings 30, which are helddown by the pressure plates 25 and 26, which operate to hold the inletand exhaust valves, respectively, in position.

The exhaustvalve as shown in Fig. 5, is provided with a plurality offins 27, which are constructed like the veins of a fan or pump with theresult that they both serve to make the valve self-cooling, and thatthey also serve to create a partial vacuum, which materially assists inexhausting the products of combustion from the engine cylinder.

The cylinders are provided with water jackets of the usual constructionand the valves are recessed intermediate the two adjacent cylinders, aportion of the wall of each cylinders being utilized, forming the valveseat. I While I have described a specific form for driving the valves,it will be obvious that many other forms may be utilized for thispurpose, and I do not wish to be understood as limiting myself to theprecise means shown in the drawings.

Having described my invention, what I regard as new and desire to secureby Letters Patent is:

1. A valve for gas engines, said valve being mounted between adjacentcylinders,

said valve being of truncated cone shape and having ports in thetapering wall, said cylinder having correspondingly shaped ports, saidlast named ports being so disposed within the cylinder that the pistoncan run over them, whereby the valve is protected from the force of theexplosion and compression. 2. A gas engine having a rotary valve oftruncated cone shape mounted intermediate adjacent cylinders, saidvalves having ports in the tapering walls thereof and correspondingports in the cylinder of the engine, said ports being so disposed withinthe cylinder that the piston can run over them, whereby the valve isprotected from the force of the explosion and compression, and meansactuated by the crank shaft to rotate said valves. j

3. A gas engine having a rotary valve of truncated cone shape mountedintermediate adjacent cylinders, said valves having ports in thetapering walls thereof and corresponding ports in the cylinder of theengine, said ports being so disposed within the cylinder that the pistoncan run over them, whereby the valve is protected from the force of theexplosion and compression,

means actuated by the crank shaft to rotate said valves, an exhaustvalve on the opposite side of said cylinder, a shaft upon which saidvalves are mounted and means to rotate said shaft.

4. A gas engine having a rotary valve of truncated cone shape mountedintermediate adjacent cylinders, said valves having ports in thetapering walls thereof and corresponding ports in the cylinder of theengine, said portsbeing so disposed within the cylinder that the pistoncan run over them, whereby the valve is protected from the force of theexplosion and compression, means actuated by the crank shaft to rotatesaid valves, and means to hold said valves to their seats. i a

5. A gas engine having a rotary valve of truncated cone shape mountedintermediate adjacent cylinders, said valves having ports in thetapering walls thereof and corresponding ports in the cylinders of theengine, said ports being so disposed within the cylinder thatthe pistoncan run over them, whereby the .valve is protected from the force of Ithe explosion and compression, means actuated by the crank shafttorotate said valves, an exhaust valveon the opposite side of saidcylinder, a shaft upon which j said valves are mounted, means to rotatesaid shaft, each'of said valves having an annular chamber adapted tocontain oil and located. on its inner face.

6. Agas engine having a rotary valve of truncated cone shape mountedintermediate adjacent cylinders, said valves having ports in thetapering walls thereof and corresponding ports in the cylinder of theengine, said ports being so disposed within the 7 A gas engine having arotary valve of truncated cone shape mounted intermediate adjacentcylinders, said valves having ports in the tapering walls thereof andcorresponding ports in the cylinder of the engine, said ports being sodisposed within the cylinder that the pistoncan run over them,

whereby the valve is protected from the force of the explosion andcompression, means actuated by the crank shaft to rotate said valves,,anexhaust valve on the opposite side of said cylinder, a shaft upon whichsaid valves are mounted, means to rotate said shaft, said shaft beingformed in two pieces, and means to yieldingly hold said two piecestogether.

8. A gas engine having rotary valves of truncated cone shape mountedintermediate adjacent cylinders, said valves having ports in thetapering Walls thereof and corresponding ports in the cylinders, meansto protect the said valves from the force of the explosion andcompression.

9. A gas engine having rotary inlet and exhaust valves mountedintermediate adjacent cylinders and on opposite sides, said valveshaving ports in the tapering Walls thereof and corresponding ports inthe cylinders, means to protect the said valves from the force of theexplosion and compression, means formed in the said exhaust valve toassist in exhausting the products of combustion.

10. A gas engine having rotary inlet and exhaust valves mountedintermediate adjacent cylinders and on opposite sides, said valveshaving ports in the tapering Walls RICHARD SCHMITZ.

Witnesses K. DOLBEY, C. M. BAUMEISTER.

Copies of this patent may be obtained for five cents each. by addressingthe Commissioner of Patents, Washington, D. 0.

